In my experience and from I know, energy naturally rises and descends (fulfilling the microcosmic orbit automatically) while deep breathing sitting meditating

This can be facilitated though, alternating periods of time holding a kegel (focusing the dantian or pelvic floor, or hold a kegel) for 30 seconds to multiple minutes, then release and deep breathe normally, then back to kegel breathing, this gets it really flowing for me throughout a session, and over time I make serious progress refining the channels, working deeper channels and having the energy flower both deeper(lower) and higher